PSS Power Pattern for SSB-PDCCH Power Difference Indication
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Solution Overview
Problem
In 5G wireless communication systems, the lack of provision for power difference between synchronization signal blocks (SSB) and physical downlink control channels (PDCCH) leads to increased error rates in decoding PDCCH, especially when the power difference exceeds 3 dB, as existing methods cannot effectively indicate or compensate for this difference.
Innovation Solution
A method and apparatus where a base station sets primary synchronization signal (PSS) transmitting powers of successive SSBs in a preset fixed pattern to indicate a power difference greater than a threshold, allowing user equipment (UE) to parse these patterns and compensate the PDCCH power accordingly, thereby reducing decoding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power difference between SSB and PDCCH is allowed to be large (up to 6 dB), then the system has more flexibility in power allocation, but the error rate of decoding PDCCH increases significantly
Solution Approach 1:
The base station performs preliminary action by setting PSS transmitting powers of successive SSBs in a preset fixed pattern before the UE needs to decode PDCCH. This allows the UE to anticipate the power difference and compensate accordingly, maintaining reliable decoding even when the actual power difference is large (up to 6 dB). The preliminary pattern establishment enables the UE to prepare compensation parameters in advance.
Solution Approach 2:
The patent introduces an intermediary mechanism where the PSS power pattern serves as a mediator between the actual power difference and the UE's decoding process. Instead of directly indicating the power difference in RMSI (which cannot be done due to parsing requirements), the PSS power pattern acts as an indirect indicator that the UE can use to calculate appropriate compensation, thus resolving the contradiction between flexibility and reliability.
2Measurement precision
If power difference indication is added in RMSI parsing, then the UE can accurately determine power difference, but the parsing process becomes more complex and may fail to acquire PDCCH
Solution Approach 1:
The patent extracts the power difference indication function from the RMSI parsing process and relocates it to the PSS power pattern. By taking out this functional requirement from the complex parsing process, the solution avoids adding complexity to RMSI parsing while still providing accurate power difference information. The PSS power pattern serves as a simpler, more reliable carrier for this information.
Solution Approach 2:
The patent uses a copying approach where the power difference information is replicated across multiple successive SSBs through the fixed pattern. Instead of transmitting a single power difference value that would increase parsing complexity, the information is distributed across multiple PSS signals, allowing the UE to infer the power difference from the pattern without complex parsing operations.
3Measurement precision
If power difference indication is added in PBCH, then the UE can determine power difference, but the PBCH content cannot be modified as it is fully pre-determined
Solution Approach 1:
The patent segments the power difference indication function from the PBCH and relocates it to the PSS power pattern. By segmenting this functionality, the solution avoids modifying the pre-determined PBCH content while still achieving accurate power difference indication. The indication is distributed across multiple PSS signals rather than being embedded in PBCH.
Data Source
AI summary
The present disclosure relates to a method and an apparatus for indicating a transmitting power difference, a method and an apparatus for compensating power, a base station, a user equipment, and a computer-readable storage medium. The method of indicating a transmitting power difference includes: in response to that a transmitting power difference between a synchronization signal block (SSB) and a physical downlink control channel (PDCCH) of remaining minimum system information (RMSI) corresponding to the SSB is greater than a preset threshold, setting, by a base station, primary synchronization signal (PSS) transmitting powers of a preset number of successive SSBs in a preset fixed pattern, where the fixed pattern indicates that the transmitting power difference is greater than the preset threshold; and transmitting the SSB to a user equipment (UE) in a beam scanning manner.